060  
FXUS01 KWBC 172033  
PMDSPD  
 
SHORT RANGE FORECAST DISCUSSION  
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD  
333 PM EST FRI NOV 17 2017  
 
VALID 00Z SAT NOV 18 2017 - 00Z MON NOV 20 2017  
   
..HEAVY PRECIPITATION POSSIBLE OVER THE OLYMPIC PENINSULA
 
 
...HEAVY PRECIPITATION POSSIBLE OVER PARTS OF THE OHIO  
VALLEY/LOWER GREAT LAKES...  
 
A FRONT EXTENDING FROM THE MIDDLE MISSISSIPPI VALLEY/CENTRAL  
PLAINS INTO CENTRAL ROCKIES/SOUTHWEST WILL MOVE EASTWARD TO THE  
EAST COAST BY SUNDAY. SHOWERS AND THUNDERSTORMS WILL DEVELOP  
ALONG AND NEAR THE WARM FRONT OVER THE MIDDLE MISSISSIPPI VALLEY  
THAT WILL EXPAND INTO THE OHIO VALLEY OVERNIGHT FRIDAY. ON  
SATURDAY AFTERNOON, THE SHOWERS AND THUNDERSTORMS WILL DEVELOP  
ALONG AND AHEAD OF THE COLD FRONT FROM THE OHIO VALLEY INTO THE  
LOWER MISSISSIPPI VALLEY THAT WILL CHANGE OVER TO RAIN OVERNIGHT  
SATURDAY FROM THE LOWER GREAT LAKES TO THE LOWER MISSISSIPPI  
VALLEY/CENTRAL GULF COAST THAT WILL MOVE TO THE EAST COAST BY  
SUNDAY MORNING. IN ADDITION, THE SYSTEM'S UPPER-LEVEL ENERGY OVER  
THE GREAT BASIN INTO THE NORTHERN ROCKIES THAT WILL LIKEWISE, MOVE  
TO THE NORTHEAST/MID-ATLANTIC BY SUNDAY. THE ENERGY WILL AID IN  
PRODUCING SNOW AND LOWER ELEVATION RAIN OVER PARTS OF THE GREAT  
BASIN/CENTRAL ROCKIES THAT WILL SLOWLY END OVER THE AREA BY  
SATURDAY MORNING.  
 
MEANWHILE, ANOTHER FRONT OVER THE UPPER GREAT LAKES/UPPER  
MISSISSIPPI VALLEY ROUGHLY NORTHWESTWARD TO THE NORTHERN HIGH  
PLAINS INTO WEST-CENTRAL CANADA WILL UNDERGO A METAMORPHOSIS AS  
THE EASTERN HALF OF THE BOUNDARY SEPARATES ON SATURDAY WHILE  
MOVING INTO CANADA BY SUNDAY MORNING. RAIN AND SNOW WILL DEVELOP  
ALONG THE EASTERN PARTS OF THE FRONT OVER THE UPPER GREAT  
LAKES/UPPER MISSISSIPPI VALLEY THAT WILL CHANGEOVER TO RAIN BY  
SATURDAY MORNING OVER THE GREAT LAKES. RAIN WILL ALSO DEVELOP  
OVER PARTS OF THE CENTRAL PLAINS/MIDDLE MISSISSIPPI VALLEY  
OVERNIGHT FRIDAY THAT WILL END BY SATURDAY AFTERNOON.  
 
MORE TO FOLLOW  
 
ZIEGENFELDER  
 
GRAPHICS AVAILABLE AT  
WWW.WPC.NCEP.NOAA.GOV/BASICWX/BASICWX_NDFD.PHP  

 
 
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